Keysight E3632A, User Manual

Page: 64 / 196

2 Operation and Features

Remote Voltage Sensing
42 E3632A User’s Guide
Output rating
The rated output voltage and current specifications in
Chapter 7 apply at the output terminals of the power
supply. With remote sensing, any voltage dropped in the
load leads must be added to the load voltage to calculate
maximum output voltage. The performance specifications are
not guaranteed when the maximum output voltage is
exceeded. If the excessive demand on the power supply
forces the power supply to lose regulation, the
Unreg
annunciator will turn on to indicate that the output is
unregulated.
Output noise
Any noise picked up on the sense leads also appears at the
output of the power supply and may adversely affect the
voltage load regulation. Twist the sense leads to minimize
external noise pickup and run them parallel and close to the
load leads. In noisy environments it may be necessary to
shield the sense leads. Ground the shield at the power
supply end only.
Do not use the shield as one of the sense
conductors.
Stability
Using remote sensing under certain combinations of load
lead lengths and large load capacitances may cause your
application to form a filter, which becomes part of the
voltage feedback loop. The extra phase shift created by this
filter can degrade the power supply’s stability, resulting in
poor transient response or loop instability. In severe cases,
it may cause oscillations. To minimize this possibility, keep
the load leads as short as possible and twist them together.
As the sense leads are part of the power supply’s
programming feedback loop, accidental open- connections of